2: Whisk flour, sugar, salt, baking powder, and baking soda together in medium bowl. In a second medium bowl, whisk together buttermilk, sour cream, eggs, and melted butter.
3: Make a well in centre of dry ingredients and pour in wet ingredients; gently stir until just combined (batter should remain lumpy with a few streaks of flour). Do not over-mix. Allow batter to sit for 10 minutes before cooking.
4: Heat 1 tsp oil in a 30cm nonstick pan over medium heat until shimmering. Using paper towels, carefully wipe out oil, leaving thin film of oil on the bottom and sides of pan. Using ¼ cup measure, portion batter into pan in 4 places. Add a few blueberries to the top of each.
5: Cook 2 to 3 minutes until edges are set, first side is golden brown, and bubbles on surface are just beginning to break. Using thin, wide spatula, flip pancake and continue to cook until second side is golden brown, 1 to 2 minutes longer. Serve pancakes immediately, or transfer to wire rack in preheated oven. Repeat with remaining batter, using remaining oil as necessary.
Tip: Left-over buttermilk - say ½ cup - is terrific combined with a dollop of sweet chilli sauce, a few tablespoons of mayonnaise, chopped chives and salt and pepper. You have home-made Ranch dressing, another American favourite.